Debugger.cc

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#include "Debugger.hh"
#include "Debuggable.hh"
#include "CliComm.hh"
#include "ProbeBreakPoint.hh"
#include "MSXMotherBoard.hh"
#include "MSXCPU.hh"
#include "MSXCPUInterface.hh"
#include "BreakPoint.hh"
#include "DebugCondition.hh"
#include "MSXWatchIODevice.hh"
#include "TclArgParser.hh"
#include "TclObject.hh"
#include "CommandException.hh"
#include "MemBuffer.hh"
#include "one_of.hh"
#include "ranges.hh"
#include "stl.hh"
#include "StringOp.hh"
#include "unreachable.hh"
#include "view.hh"
#include "xrange.hh"
#include <array>
#include <cassert>
#include <memory>
 
using std::string;
using std::string_view;
 
namespace openmsx {
 
Debugger::Debugger(MSXMotherBoard& motherBoard_)
        : motherBoard(motherBoard_)
        , cmd(motherBoard.getCommandController(),
              motherBoard.getStateChangeDistributor(),
              motherBoard.getScheduler())
{
}
 
Debugger::~Debugger()
{
        assert(!cpu);
        assert(debuggables.empty());
}
 
void Debugger::registerDebuggable(string name, Debuggable& debuggable)
{
        assert(!debuggables.contains(name));
        debuggables.emplace_noDuplicateCheck(std::move(name), &debuggable);
}
 
void Debugger::unregisterDebuggable(string_view name, Debuggable& debuggable)
{
        assert(debuggables.contains(name));
        assert(debuggables[name] == &debuggable); (void)debuggable;
        debuggables.erase(name);
}
 
Debuggable* Debugger::findDebuggable(string_view name)
{
        auto* v = lookup(debuggables, name);
        return v ? *v : nullptr;
}
 
Debuggable& Debugger::getDebuggable(string_view name)
{
        Debuggable* result = findDebuggable(name);
        if (!result) {
                throw CommandException("No such debuggable: ", name);
        }
        return *result;
}
 
void Debugger::registerProbe(ProbeBase& probe)
{
        assert(!probes.contains(probe.getName()));
        probes.insert_noDuplicateCheck(&probe);
}
 
void Debugger::unregisterProbe(ProbeBase& probe)
{
        assert(probes.contains(probe.getName()));
        probes.erase(probe.getName());
}
 
ProbeBase* Debugger::findProbe(string_view name)
{
        auto it = probes.find(name);
        return (it != std::end(probes)) ? *it : nullptr;
}
 
ProbeBase& Debugger::getProbe(string_view name)
{
        auto* result = findProbe(name);
        if (!result) {
                throw CommandException("No such probe: ", name);
        }
        return *result;
}
 
unsigned Debugger::insertProbeBreakPoint(
        TclObject command, TclObject condition,
        ProbeBase& probe, bool once, unsigned newId /*= -1*/)
{
        auto bp = std::make_unique<ProbeBreakPoint>(
                std::move(command), std::move(condition), *this, probe, once, newId);
        unsigned result = bp->getId();
        motherBoard.getMSXCliComm().update(CliComm::DEBUG_UPDT, tmpStrCat("pp#", result), "add");
        probeBreakPoints.push_back(std::move(bp));
        return result;
}
 
void Debugger::removeProbeBreakPoint(string_view name)
{
        if (name.starts_with("pp#")) {
                // remove by id
                if (auto id = StringOp::stringToBase<10, unsigned>(name.substr(3))) {
                        if (auto it = ranges::find(probeBreakPoints, id, &ProbeBreakPoint::getId);
                            it != std::end(probeBreakPoints)) {
                                motherBoard.getMSXCliComm().update(
                                        CliComm::DEBUG_UPDT, name, "remove");
                                move_pop_back(probeBreakPoints, it);
                                return;
                        }
                }
                throw CommandException("No such breakpoint: ", name);
        } else {
                // remove by probe, only works for unconditional bp
                auto it = ranges::find(probeBreakPoints, name, [](auto& bp) {
                        return bp->getProbe().getName();
                });
                if (it == std::end(probeBreakPoints)) {
                        throw CommandException(
                                "No (unconditional) breakpoint for probe: ", name);
                }
                motherBoard.getMSXCliComm().update(
                        CliComm::DEBUG_UPDT, tmpStrCat("pp#", (*it)->getId()), "remove");
                move_pop_back(probeBreakPoints, it);
        }
}
 
void Debugger::removeProbeBreakPoint(ProbeBreakPoint& bp)
{
        motherBoard.getMSXCliComm().update(
                CliComm::DEBUG_UPDT, tmpStrCat("pp#", bp.getId()), "remove");
        move_pop_back(probeBreakPoints, rfind_unguarded(probeBreakPoints, &bp,
                [](auto& v) { return v.get(); }));
}
 
unsigned Debugger::setWatchPoint(TclObject command, TclObject condition,
                                 WatchPoint::Type type,
                                 unsigned beginAddr, unsigned endAddr,
                                 bool once, unsigned newId /*= -1*/)
{
        std::shared_ptr<WatchPoint> wp;
        if (type == one_of(WatchPoint::READ_IO, WatchPoint::WRITE_IO)) {
                wp = std::make_shared<WatchIO>(
                        motherBoard, type, beginAddr, endAddr,
                        std::move(command), std::move(condition), once, newId);
        } else {
                wp = std::make_shared<WatchPoint>(
                        std::move(command), std::move(condition), type, beginAddr, endAddr, once, newId);
        }
        motherBoard.getCPUInterface().setWatchPoint(wp);
        return wp->getId();
}
 
void Debugger::transfer(Debugger& other)
{
        // Copy watchpoints to new machine.
        assert(motherBoard.getCPUInterface().getWatchPoints().empty());
        for (const auto& wp : other.motherBoard.getCPUInterface().getWatchPoints()) {
                setWatchPoint(wp->getCommandObj(), wp->getConditionObj(),
                              wp->getType(),       wp->getBeginAddress(),
                              wp->getEndAddress(), wp->onlyOnce(),
                              wp->getId());
        }
 
        // Copy probes to new machine.
        assert(probeBreakPoints.empty());
        for (auto& bp : other.probeBreakPoints) {
                if (ProbeBase* probe = findProbe(bp->getProbe().getName())) {
                        insertProbeBreakPoint(bp->getCommandObj(),
                                              bp->getConditionObj(),
                                              *probe, bp->onlyOnce(),
                                              bp->getId());
                }
        }
 
        // Breakpoints and conditions are (currently) global, so no need to
        // copy those.
}
 
 
// class Debugger::Cmd
 
static word getAddress(Interpreter& interp, const TclObject& token)
{
        unsigned addr = token.getInt(interp);
        if (addr >= 0x10000) {
                throw CommandException("Invalid address");
        }
        return addr;
}
 
Debugger::Cmd::Cmd(CommandController& commandController_,
                   StateChangeDistributor& stateChangeDistributor_,
                   Scheduler& scheduler_)
        : RecordedCommand(commandController_, stateChangeDistributor_,
                          scheduler_, "debug")
{
}
 
bool Debugger::Cmd::needRecord(std::span<const TclObject> tokens) const
{
        // Note: it's crucial for security that only the write and write_block
        // subcommands are recorded and replayed. The 'set_bp' command for
        // example would allow to set a callback that can execute arbitrary Tcl
        // code. See comments in RecordedCommand for more details.
        if (tokens.size() < 2) return false;
        return tokens[1].getString() == one_of("write", "write_block");
}
 
void Debugger::Cmd::execute(
        std::span<const TclObject> tokens, TclObject& result, EmuTime::param /*time*/)
{
        checkNumArgs(tokens, AtLeast{2}, "subcommand ?arg ...?");
        executeSubCommand(tokens[1].getString(),
                "read",              [&]{ read(tokens, result); },
                "read_block",        [&]{ readBlock(tokens, result); },
                "write",             [&]{ write(tokens, result); },
                "write_block",       [&]{ writeBlock(tokens, result); },
                "size",              [&]{ size(tokens, result); },
                "desc",              [&]{ desc(tokens, result); },
                "list",              [&]{ list(result); },
                "step",              [&]{ debugger().motherBoard.getCPUInterface().doStep(); },
                "cont",              [&]{ debugger().motherBoard.getCPUInterface().doContinue(); },
                "disasm",            [&]{ debugger().cpu->disasmCommand(getInterpreter(), tokens, result); },
                "break",             [&]{ debugger().motherBoard.getCPUInterface().doBreak(); },
                "breaked",           [&]{ result = debugger().motherBoard.getCPUInterface().isBreaked(); },
                "set_bp",            [&]{ setBreakPoint(tokens, result); },
                "remove_bp",         [&]{ removeBreakPoint(tokens, result); },
                "list_bp",           [&]{ listBreakPoints(tokens, result); },
                "set_watchpoint",    [&]{ setWatchPoint(tokens, result); },
                "remove_watchpoint", [&]{ removeWatchPoint(tokens, result); },
                "list_watchpoints",  [&]{ listWatchPoints(tokens, result); },
                "set_condition",     [&]{ setCondition(tokens, result); },
                "remove_condition",  [&]{ removeCondition(tokens, result); },
                "list_conditions",   [&]{ listConditions(tokens, result); },
                "probe",             [&]{ probe(tokens, result); });
}
 
void Debugger::Cmd::list(TclObject& result)
{
        result.addListElements(view::keys(debugger().debuggables));
}
 
void Debugger::Cmd::desc(std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, 3, "debuggable");
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        result = device.getDescription();
}
 
void Debugger::Cmd::size(std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, 3, "debuggable");
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        result = device.getSize();
}
 
void Debugger::Cmd::read(std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, 4, Prefix{2}, "debuggable address");
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        unsigned addr = tokens[3].getInt(getInterpreter());
        if (addr >= device.getSize()) {
                throw CommandException("Invalid address");
        }
        result = device.read(addr);
}
 
void Debugger::Cmd::readBlock(std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, 5, Prefix{2}, "debuggable address size");
        auto& interp = getInterpreter();
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        unsigned devSize = device.getSize();
        unsigned addr = tokens[3].getInt(interp);
        if (addr >= devSize) {
                throw CommandException("Invalid address");
        }
        unsigned num = tokens[4].getInt(interp);
        if (num > (devSize - addr)) {
                throw CommandException("Invalid size");
        }
 
        MemBuffer<byte> buf(num);
        for (auto i : xrange(num)) {
                buf[i] = device.read(addr + i);
        }
        result = std::span<byte>{buf.data(), num};
}
 
void Debugger::Cmd::write(std::span<const TclObject> tokens, TclObject& /*result*/)
{
        checkNumArgs(tokens, 5, Prefix{2}, "debuggable address value");
        auto& interp = getInterpreter();
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        unsigned addr = tokens[3].getInt(interp);
        if (addr >= device.getSize()) {
                throw CommandException("Invalid address");
        }
        unsigned value = tokens[4].getInt(interp);
        if (value >= 256) {
                throw CommandException("Invalid value");
        }
 
        device.write(addr, value);
}
 
void Debugger::Cmd::writeBlock(std::span<const TclObject> tokens, TclObject& /*result*/)
{
        checkNumArgs(tokens, 5, Prefix{2}, "debuggable address values");
        Debuggable& device = debugger().getDebuggable(tokens[2].getString());
        unsigned devSize = device.getSize();
        unsigned addr = tokens[3].getInt(getInterpreter());
        if (addr >= devSize) {
                throw CommandException("Invalid address");
        }
        auto buf = tokens[4].getBinary();
        if ((buf.size() + addr) > devSize) {
                throw CommandException("Invalid size");
        }
 
        for (auto i : xrange(buf.size())) {
                device.write(unsigned(addr + i), buf[i]);
        }
}
 
void Debugger::Cmd::setBreakPoint(std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, AtLeast{3}, "address ?-once? ?condition? ?command?");
        TclObject command("debug break");
        TclObject condition;
        bool once = false;
 
        ArgsInfo info[] = { flagArg("-once", once) };
        auto arguments = parseTclArgs(getInterpreter(), tokens.subspan(2), info);
        if ((arguments.size() < 1) || (arguments.size() > 3)) {
                throw SyntaxError();
        }
 
        switch (arguments.size()) {
        case 3: // command
                command = arguments[2];
                [[fallthrough]];
        case 2: // condition
                condition = arguments[1];
                [[fallthrough]];
        case 1: { // address
                word addr = getAddress(getInterpreter(), arguments[0]);
                BreakPoint bp(addr, command, condition, once);
                result = tmpStrCat("bp#", bp.getId());
                debugger().motherBoard.getCPUInterface().insertBreakPoint(std::move(bp));
                break;
        }
        }
}
 
void Debugger::Cmd::removeBreakPoint(
        std::span<const TclObject> tokens, TclObject& /*result*/)
{
        checkNumArgs(tokens, 3, "id|address");
        auto& interface = debugger().motherBoard.getCPUInterface();
        auto& breakPoints = interface.getBreakPoints();
 
        string_view tmp = tokens[2].getString();
        if (tmp.starts_with("bp#")) {
                // remove by id
                if (auto id = StringOp::stringToBase<10, unsigned>(tmp.substr(3))) {
                        if (auto it = ranges::find(breakPoints, id, &BreakPoint::getId);
                            it != std::end(breakPoints)) {
                                interface.removeBreakPoint(*it);
                                return;
                        }
                }
                throw CommandException("No such breakpoint: ", tmp);
        } else {
                // remove by addr, only works for unconditional bp
                word addr = getAddress(getInterpreter(), tokens[2]);
                auto [first, last] = ranges::equal_range(breakPoints, addr, {}, &BreakPoint::getAddress);
                auto it = std::find_if(first, last, [](auto& bp) {
                        return bp.getCondition().empty();
                });
                if (it == last) {
                        throw CommandException(
                                "No (unconditional) breakpoint at address: ", tmp);
                }
                interface.removeBreakPoint(*it);
        }
}
 
void Debugger::Cmd::listBreakPoints(
        std::span<const TclObject> /*tokens*/, TclObject& result)
{
        string res;
        auto& interface = debugger().motherBoard.getCPUInterface();
        for (const auto& bp : interface.getBreakPoints()) {
                TclObject line = makeTclList(
                        tmpStrCat("bp#", bp.getId()),
                        tmpStrCat("0x", hex_string<4>(bp.getAddress())),
                        bp.getCondition(),
                        bp.getCommand());
                strAppend(res, line.getString(), '\n');
        }
        result = res;
}
 
 
void Debugger::Cmd::setWatchPoint(std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, AtLeast{4}, Prefix{2}, "type address ?-once? ?condition? ?command?");
        TclObject command("debug break");
        TclObject condition;
        unsigned beginAddr, endAddr;
        WatchPoint::Type type;
        bool once = false;
 
        ArgsInfo info[] = { flagArg("-once", once) };
        auto arguments = parseTclArgs(getInterpreter(), tokens.subspan(2), info);
        if ((arguments.size() < 2) || (arguments.size() > 4)) {
                throw SyntaxError();
        }
 
        switch (arguments.size()) {
        case 4: // command
                command = arguments[3];
                [[fallthrough]];
        case 3: // condition
                condition = arguments[2];
                [[fallthrough]];
        case 2: { // address + type
                string_view typeStr = arguments[0].getString();
                unsigned max = [&] {
                        if (typeStr == "read_io") {
                                type = WatchPoint::READ_IO;
                                return 0x100;
                        } else if (typeStr == "write_io") {
                                type = WatchPoint::WRITE_IO;
                                return 0x100;
                        } else if (typeStr == "read_mem") {
                                type = WatchPoint::READ_MEM;
                                return 0x10000;
                        } else if (typeStr == "write_mem") {
                                type = WatchPoint::WRITE_MEM;
                                return 0x10000;
                        } else {
                                throw CommandException("Invalid type: ", typeStr);
                        }
                }();
                auto& interp = getInterpreter();
                if (arguments[1].getListLength(interp) == 2) {
                        beginAddr = arguments[1].getListIndex(interp, 0).getInt(interp);
                        endAddr   = arguments[1].getListIndex(interp, 1).getInt(interp);
                        if (endAddr < beginAddr) {
                                throw CommandException(
                                        "Not a valid range: end address may "
                                        "not be smaller than begin address.");
                        }
                } else {
                        beginAddr = endAddr = arguments[1].getInt(interp);
                }
                if (endAddr >= max) {
                        throw CommandException("Invalid address: out of range");
                }
                break;
        }
        default:
                UNREACHABLE; break;
        }
        unsigned id = debugger().setWatchPoint(
                command, condition, type, beginAddr, endAddr, once);
        result = tmpStrCat("wp#", id);
}
 
void Debugger::Cmd::removeWatchPoint(
        std::span<const TclObject> tokens, TclObject& /*result*/)
{
        checkNumArgs(tokens, 3, "id");
        string_view tmp = tokens[2].getString();
        if (tmp.starts_with("wp#")) {
                // remove by id
                if (auto id = StringOp::stringToBase<10, unsigned>(tmp.substr(3))) {
                        auto& interface = debugger().motherBoard.getCPUInterface();
                        for (auto& wp : interface.getWatchPoints()) {
                                if (wp->getId() == *id) {
                                        interface.removeWatchPoint(wp);
                                        return;
                                }
                        }
                }
        }
        throw CommandException("No such watchpoint: ", tmp);
}
 
void Debugger::Cmd::listWatchPoints(
        std::span<const TclObject> /*tokens*/, TclObject& result)
{
        string res;
        auto& interface = debugger().motherBoard.getCPUInterface();
        for (const auto& wp : interface.getWatchPoints()) {
                TclObject line = makeTclList(tmpStrCat("wp#", wp->getId()));
                string type;
                switch (wp->getType()) {
                case WatchPoint::READ_IO:
                        type = "read_io";
                        break;
                case WatchPoint::WRITE_IO:
                        type = "write_io";
                        break;
                case WatchPoint::READ_MEM:
                        type = "read_mem";
                        break;
                case WatchPoint::WRITE_MEM:
                        type = "write_mem";
                        break;
                default:
                        UNREACHABLE; break;
                }
                line.addListElement(type);
                unsigned beginAddr = wp->getBeginAddress();
                unsigned endAddr   = wp->getEndAddress();
                if (beginAddr == endAddr) {
                        line.addListElement(tmpStrCat("0x", hex_string<4>(beginAddr)));
                } else {
                        line.addListElement(makeTclList(
                                tmpStrCat("0x", hex_string<4>(beginAddr)),
                                tmpStrCat("0x", hex_string<4>(endAddr))));
                }
                line.addListElement(wp->getCondition(),
                                    wp->getCommand());
                strAppend(res, line.getString(), '\n');
        }
        result = res;
}
 
 
void Debugger::Cmd::setCondition(std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, AtLeast{3}, "condition ?-once? ?command?");
        TclObject command("debug break");
        TclObject condition;
        bool once = false;
 
        ArgsInfo info[] = { flagArg("-once", once) };
        auto arguments = parseTclArgs(getInterpreter(), tokens.subspan(2), info);
        if ((arguments.size() < 1) || (arguments.size() > 2)) {
                throw SyntaxError();
        }
 
        switch (arguments.size()) {
        case 2: // command
                command = arguments[1];
                [[fallthrough]];
        case 1: { // condition
                condition = arguments[0];
                DebugCondition dc(command, condition, once);
                result = tmpStrCat("cond#", dc.getId());
                debugger().motherBoard.getCPUInterface().setCondition(std::move(dc));
                break;
        }
        }
}
 
void Debugger::Cmd::removeCondition(
        std::span<const TclObject> tokens, TclObject& /*result*/)
{
        checkNumArgs(tokens, 3, "id");
 
        string_view tmp = tokens[2].getString();
        if (tmp.starts_with("cond#")) {
                // remove by id
                if (auto id = StringOp::stringToBase<10, unsigned>(tmp.substr(5))) {
                        auto& interface = debugger().motherBoard.getCPUInterface();
                        for (auto& c : interface.getConditions()) {
                                if (c.getId() == *id) {
                                        interface.removeCondition(c);
                                        return;
                                }
                        }
                }
        }
        throw CommandException("No such condition: ", tmp);
}
 
void Debugger::Cmd::listConditions(
        std::span<const TclObject> /*tokens*/, TclObject& result)
{
        string res;
        auto& interface = debugger().motherBoard.getCPUInterface();
        for (const auto& c : interface.getConditions()) {
                TclObject line = makeTclList(tmpStrCat("cond#", c.getId()),
                                             c.getCondition(),
                                             c.getCommand());
                strAppend(res, line.getString(), '\n');
        }
        result = res;
}
 
 
void Debugger::Cmd::probe(std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, AtLeast{3}, "subcommand ?arg ...?");
        executeSubCommand(tokens[2].getString(),
                "list",      [&]{ probeList(tokens, result); },
                "desc",      [&]{ probeDesc(tokens, result); },
                "read",      [&]{ probeRead(tokens, result); },
                "set_bp",    [&]{ probeSetBreakPoint(tokens, result); },
                "remove_bp", [&]{ probeRemoveBreakPoint(tokens, result); },
                "list_bp",   [&]{ probeListBreakPoints(tokens, result); });
}
void Debugger::Cmd::probeList(std::span<const TclObject> /*tokens*/, TclObject& result)
{
        result.addListElements(view::transform(debugger().probes,
                [](auto* p) { return p->getName(); }));
}
void Debugger::Cmd::probeDesc(std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, 4, "probe");
        result = debugger().getProbe(tokens[3].getString()).getDescription();
}
void Debugger::Cmd::probeRead(std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, 4, "probe");
        result = debugger().getProbe(tokens[3].getString()).getValue();
}
void Debugger::Cmd::probeSetBreakPoint(
        std::span<const TclObject> tokens, TclObject& result)
{
        checkNumArgs(tokens, AtLeast{4}, "probe ?-once? ?condition? ?command?");
        TclObject command("debug break");
        TclObject condition;
        ProbeBase* p;
        bool once = false;
 
        ArgsInfo info[] = { flagArg("-once", once) };
        auto arguments = parseTclArgs(getInterpreter(), tokens.subspan(3), info);
        if ((arguments.size() < 1) || (arguments.size() > 3)) {
                throw SyntaxError();
        }
 
        switch (arguments.size()) {
        case 3: // command
                command = arguments[2];
                [[fallthrough]];
        case 2: // condition
                condition = arguments[1];
                [[fallthrough]];
        case 1: { // probe
                p = &debugger().getProbe(arguments[0].getString());
                break;
        }
        default:
                UNREACHABLE; break;
        }
 
        unsigned id = debugger().insertProbeBreakPoint(command, condition, *p, once);
        result = tmpStrCat("pp#", id);
}
void Debugger::Cmd::probeRemoveBreakPoint(
        std::span<const TclObject> tokens, TclObject& /*result*/)
{
        checkNumArgs(tokens, 4, "id");
        debugger().removeProbeBreakPoint(tokens[3].getString());
}
void Debugger::Cmd::probeListBreakPoints(
        std::span<const TclObject> /*tokens*/, TclObject& result)
{
        string res;
        for (auto& p : debugger().probeBreakPoints) {
                TclObject line = makeTclList(tmpStrCat("pp#", p->getId()),
                                             p->getProbe().getName(),
                                             p->getCondition(),
                                             p->getCommand());
                strAppend(res, line.getString(), '\n');
        }
        result = res;
}
 
string Debugger::Cmd::help(std::span<const TclObject> tokens) const
{
        auto generalHelp =
                "debug <subcommand> [<arguments>]\n"
                "  Possible subcommands are:\n"
                "    list              returns a list of all debuggables\n"
                "    desc              returns a description of this debuggable\n"
                "    size              returns the size of this debuggable\n"
                "    read              read a byte from a debuggable\n"
                "    write             write a byte to a debuggable\n"
                "    read_block        read a whole block at once\n"
                "    write_block       write a whole block at once\n"
                "    set_bp            insert a new breakpoint\n"
                "    remove_bp         remove a certain breakpoint\n"
                "    list_bp           list the active breakpoints\n"
                "    set_watchpoint    insert a new watchpoint\n"
                "    remove_watchpoint remove a certain watchpoint\n"
                "    list_watchpoints  list the active watchpoints\n"
                "    set_condition     insert a new condition\n"
                "    remove_condition  remove a certain condition\n"
                "    list_conditions   list the active conditions\n"
                "    probe             probe related subcommands\n"
                "    cont              continue execution after break\n"
                "    step              execute one instruction\n"
                "    break             break CPU at current position\n"
                "    breaked           query CPU breaked status\n"
                "    disasm            disassemble instructions\n"
                "  The arguments are specific for each subcommand.\n"
                "  Type 'help debug <subcommand>' for help about a specific subcommand.\n";
 
        auto listHelp =
                "debug list\n"
                "  Returns a list with the names of all 'debuggables'.\n"
                "  These names are used in other debug subcommands.\n";
        auto descHelp =
                "debug desc <name>\n"
                "  Returns a description for the debuggable with given name.\n";
        auto sizeHelp =
                "debug size <name>\n"
                "  Returns the size (in bytes) of the debuggable with given name.\n";
        auto readHelp =
                "debug read <name> <addr>\n"
                "  Read a byte at offset <addr> from the given debuggable.\n"
                "  The offset must be smaller than the value returned from the "
                "'size' subcommand\n"
                "  Note that openMSX comes with a bunch of Tcl scripts that make "
                "some of the debug reads much more convenient (e.g. reading from "
                "Z80 or VDP registers). See the Console Command Reference for more "
                "details about these.\n";
        auto writeHelp =
                "debug write <name> <addr> <val>\n"
                "  Write a byte to the given debuggable at a certain offset.\n"
                "  The offset must be smaller than the value returned from the "
                "'size' subcommand\n";
        auto readBlockHelp =
                "debug read_block <name> <addr> <size>\n"
                "  Read a whole block at once. This is equivalent with repeated "
                "invocations of the 'read' subcommand, but using this subcommand "
                "may be faster. The result is a Tcl binary string (see Tcl manual).\n"
                "  The block is specified as size/offset in the debuggable. The "
                "complete block must fit in the debuggable (see the 'size' "
                "subcommand).\n";
        auto writeBlockHelp =
                "debug write_block <name> <addr> <values>\n"
                "  Write a whole block at once. This is equivalent with repeated "
                "invocations of the 'write' subcommand, but using this subcommand "
                "may be faster. The <values> argument must be a Tcl binary string "
                "(see Tcl manual).\n"
                "  The block has a size and an offset in the debuggable. The "
                "complete block must fit in the debuggable (see the 'size' "
                "subcommand).\n";
        auto setBpHelp =
                "debug set_bp [-once] <addr> [<cond>] [<cmd>]\n"
                "  Insert a new breakpoint at given address. When the CPU is about "
                "to execute the instruction at this address, execution will be "
                "breaked. At least this is the default behaviour, see next "
                "paragraphs.\n"
                "  When the -once flag is given, the breakpoint is automatically "
                "removed after it triggered. In other words: it only triggers once.\n"
                "  Optionally you can specify a condition. When the CPU reaches "
                "the breakpoint this condition is evaluated, only when the condition "
                "evaluated to true execution will be breaked.\n"
                "  A condition must be specified as a Tcl expression. For example\n"
                "     debug set_bp 0xf37d {[reg C] == 0x2F}\n"
                "  This breaks on address 0xf37d but only when Z80 register C has the "
                "value 0x2F.\n"
                "  Also optionally you can specify a command that should be "
                "executed when the breakpoint is reached (and condition is true). "
                "By default this command is 'debug break'.\n"
                "  The result of this command is a breakpoint ID. This ID can "
                "later be used to remove this breakpoint again.\n";
        auto removeBpHelp =
                "debug remove_bp <id>\n"
                "  Remove the breakpoint with given ID again. You can use the "
                "'list_bp' subcommand to see all valid IDs.\n";
        auto listBpHelp =
                "debug list_bp\n"
                "  Lists all active breakpoints. The result is printed in 4 "
                "columns. The first column contains the breakpoint ID. The "
                "second one has the address. The third has the condition "
                "(default condition is empty). And the last column contains "
                "the command that will be executed (default is 'debug break').\n";
        auto setWatchPointHelp =
                "debug set_watchpoint [-once] <type> <region> [<cond>] [<cmd>]\n"
                "  Insert a new watchpoint of given type on the given region, "
                "there can be an optional -once flag, a condition and alternative "
                "command. See the 'set_bp' subcommand for details about these.\n"
                "  Type must be one of the following:\n"
                "    read_io    break when CPU reads from given IO port(s)\n"
                "    write_io   break when CPU writes to given IO port(s)\n"
                "    read_mem   break when CPU reads from given memory location(s)\n"
                "    write_mem  break when CPU writes to given memory location(s)\n"
                "  Region is either a single value, this corresponds to a single "
                "memory location or IO port. Otherwise region must be a list of "
                "two values (enclosed in braces) that specify a begin and end "
                "point of a whole memory region or a range of IO ports.\n"
                "During the execution of <cmd>, the following global Tcl "
                "variables are set:\n"
                "  ::wp_last_address   this is the actual address of the mem/io "
                "read/write that triggered the watchpoint\n"
                "  ::wp_last_value     this is the actual value that was written "
                "by the mem/io write that triggered the watchpoint\n"
                "Examples:\n"
                "  debug set_watchpoint write_io 0x99 {[reg A] == 0x81}\n"
                "  debug set_watchpoint read_mem {0xfbe5 0xfbef}\n";
        auto removeWatchPointHelp =
                "debug remove_watchpoint <id>\n"
                "  Remove the watchpoint with given ID again. You can use the "
                "'list_watchpoints' subcommand to see all valid IDs.\n";
        auto listWatchPointsHelp =
                "debug list_watchpoints\n"
                "  Lists all active watchpoints. The result is similar to the "
                "'list_bp' subcommand, but there is an extra column (2nd column) "
                "that contains the type of the watchpoint.\n";
        auto setCondHelp =
                "debug set_condition [-once] <cond> [<cmd>]\n"
                "  Insert a new condition. These are much like breakpoints, "
                "except that they are checked before every instruction "
                "(breakpoints are tied to a specific address).\n"
                "  Conditions will slow down simulation MUCH more than "
                "breakpoints. So only use them when you don't care about "
                "simulation speed (when you're debugging this is usually not "
                "a problem).\n"
                "  See 'help debug set_bp' for more details.\n";
        auto removeCondHelp =
                "debug remove_condition <id>\n"
                "  Remove the condition with given ID again. You can use the "
                "'list_conditions' subcommand to see all valid IDs.\n";
        auto listCondHelp =
                "debug list_conditions\n"
                "  Lists all active conditions. The result is similar to the "
                "'list_bp' subcommand, but without the 2nd column that would "
                "show the address.\n";
        auto probeHelp =
                "debug probe <subcommand> [<arguments>]\n"
                "  Possible subcommands are:\n"
                "    list                                     returns a list of all probes\n"
                "    desc   <probe>                           returns a description of this probe\n"
                "    read   <probe>                           returns the current value of this probe\n"
                "    set_bp <probe> [-once] [<cond>] [<cmd>]  set a breakpoint on the given probe\n"
                "    remove_bp <id>                           remove the given breakpoint\n"
                "    list_bp                                  returns a list of breakpoints that are set on probes\n";
        auto contHelp =
                "debug cont\n"
                "  Continue execution after CPU was breaked.\n";
        auto stepHelp =
                "debug step\n"
                "  Execute one instruction. This command is only meaningful in "
                "break mode.\n";
        auto breakHelp =
                "debug break\n"
                "  Immediately break CPU execution. When CPU was already breaked "
                "this command has no effect.\n";
        auto breakedHelp =
                "debug breaked\n"
                "  Query the CPU breaked status. Returns '1' when CPU was "
                "breaked, '0' otherwise.\n";
        auto disasmHelp =
                "debug disasm <addr>\n"
                "  Disassemble the instruction at the given address. The result "
                "is a Tcl list. The first element in the list contains a textual "
                "representation of the instruction, the next elements contain the "
                "bytes that make up this instruction (thus the length of the "
                "resulting list can be used to derive the number of bytes in the "
                "instruction).\n"
                "  Note that openMSX comes with a 'disasm' Tcl script that is much "
                "more convenient to use than this subcommand.";
        auto unknownHelp =
                "Unknown subcommand, use 'help debug' to see a list of valid "
                "subcommands.\n";
 
        if (tokens.size() == 1) {
                return generalHelp;
        } else if (tokens[1] == "list") {
                return listHelp;
        } else if (tokens[1] == "desc") {
                return descHelp;
        } else if (tokens[1] == "size") {
                return sizeHelp;
        } else if (tokens[1] == "read") {
                return readHelp;
        } else if (tokens[1] == "write") {
                return writeHelp;
        } else if (tokens[1] == "read_block") {
                return readBlockHelp;
        } else if (tokens[1] == "write_block") {
                return writeBlockHelp;
        } else if (tokens[1] == "set_bp") {
                return setBpHelp;
        } else if (tokens[1] == "remove_bp") {
                return removeBpHelp;
        } else if (tokens[1] == "list_bp") {
                return listBpHelp;
        } else if (tokens[1] == "set_watchpoint") {
                return setWatchPointHelp;
        } else if (tokens[1] == "remove_watchpoint") {
                return removeWatchPointHelp;
        } else if (tokens[1] == "list_watchpoints") {
                return listWatchPointsHelp;
        } else if (tokens[1] == "set_condition") {
                return setCondHelp;
        } else if (tokens[1] == "remove_condition") {
                return removeCondHelp;
        } else if (tokens[1] == "list_conditions") {
                return listCondHelp;
        } else if (tokens[1] == "probe") {
                return probeHelp;
        } else if (tokens[1] == "cont") {
                return contHelp;
        } else if (tokens[1] == "step") {
                return stepHelp;
        } else if (tokens[1] == "break") {
                return breakHelp;
        } else if (tokens[1] == "breaked") {
                return breakedHelp;
        } else if (tokens[1] == "disasm") {
                return disasmHelp;
        } else {
                return unknownHelp;
        }
}
 
std::vector<string> Debugger::Cmd::getBreakPointIds() const
{
        return to_vector(view::transform(
                debugger().motherBoard.getCPUInterface().getBreakPoints(),
                [](auto& bp) { return strCat("bp#", bp.getId()); }));
}
std::vector<string> Debugger::Cmd::getWatchPointIds() const
{
        return to_vector(view::transform(
                debugger().motherBoard.getCPUInterface().getWatchPoints(),
                [](auto& w) { return strCat("wp#", w->getId()); }));
}
std::vector<string> Debugger::Cmd::getConditionIds() const
{
        return to_vector(view::transform(
                debugger().motherBoard.getCPUInterface().getConditions(),
                [](auto& c) { return strCat("cond#", c.getId()); }));
}
 
void Debugger::Cmd::tabCompletion(std::vector<string>& tokens) const
{
        using namespace std::literals;
        static constexpr std::array singleArgCmds = {
                "list"sv, "step"sv, "cont"sv, "break"sv, "breaked"sv,
                "list_bp"sv, "list_watchpoints"sv, "list_conditions"sv,
        };
        static constexpr std::array debuggableArgCmds = {
                "desc"sv, "size"sv, "read"sv, "read_block"sv,
                "write"sv, "write_block"sv,
        };
        static constexpr std::array otherCmds = {
                "disasm"sv, "set_bp"sv, "remove_bp"sv, "set_watchpoint"sv,
                "remove_watchpoint"sv, "set_condition"sv, "remove_condition"sv,
                "probe"sv,
        };
        switch (tokens.size()) {
        case 2: {
                completeString(tokens, concatArray(singleArgCmds, debuggableArgCmds, otherCmds));
                break;
        }
        case 3:
                if (!contains(singleArgCmds, tokens[1])) {
                        // this command takes (an) argument(s)
                        if (contains(debuggableArgCmds, tokens[1])) {
                                // it takes a debuggable here
                                completeString(tokens, view::keys(debugger().debuggables));
                        } else if (tokens[1] == "remove_bp") {
                                // this one takes a bp id
                                completeString(tokens, getBreakPointIds());
                        } else if (tokens[1] == "remove_watchpoint") {
                                // this one takes a wp id
                                completeString(tokens, getWatchPointIds());
                        } else if (tokens[1] == "remove_condition") {
                                // this one takes a cond id
                                completeString(tokens, getConditionIds());
                        } else if (tokens[1] == "set_watchpoint") {
                                static constexpr std::array types = {
                                        "write_io"sv, "write_mem"sv,
                                        "read_io"sv, "read_mem"sv,
                                };
                                completeString(tokens, types);
                        } else if (tokens[1] == "probe") {
                                static constexpr std::array subCmds = {
                                        "list"sv, "desc"sv, "read"sv, "set_bp"sv,
                                        "remove_bp"sv, "list_bp"sv,
                                };
                                completeString(tokens, subCmds);
                        }
                }
                break;
        case 4:
                if ((tokens[1] == "probe") &&
                    (tokens[2] == one_of("desc", "read", "set_bp"))) {
                        completeString(tokens, view::transform(
                                debugger().probes,
                                [](auto* p) -> std::string_view { return p->getName(); }));
                }
                break;
        }
}
 
} // namespace openmsx